ASTM-D1907

Designation:D1907–07StandardTestMethodforLinearDensityofYarn(YarnNumber)bytheSkeinMethod1ThisstandardisissuedunderthefixeddesignationD1907;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthelineardensityofalltypesofyarninpackageform,subjecttothelimitationsofsizeandstretchgivenin1.2and1.3.Provisionismadeforexpressingyarnlineardensityinallthetraditionalyarnnumberingsystems.1.2Thismethodisapplicabletoyarnsthatstretchlessthan5%whentensionontheyarnisincreasedfrom0.25to0.75cN/tex(0.25to0.75gf/tex).Bymutualagreement,anduseofalowerthanspecifiedreelingtension,thismethodmayalsobeadaptedtomeasurethelineardensityofyarnsthatstretchmorethan5%,undertheaboveforce.1.3Thismethodisapplicabletoyarnsfinerthan2000tex.However,itmaybealsoadaptedtocoarseryarnsbytheuseofskeinsofshorterthanspecifiedlengths,andalternatereelingconditions,agreeabletotheinterestedparties.1.4Dependingontheprocedureusedtocalculatethemoisturecontentoftheyarnbeingtested,anditsactualmoisturecontent,orfinishcontent,orboth,oneormoreofthefollowingoptionsmaybeutilized.1.4.1UnscouredYarn:Option1—Yarnatequilibriumwiththestandardatmospherefortestingtextiles.Option2—Oven-driedyarn.Option3—Oven-driedyarn,pluscommercialmoisturere-gain.1.4.2ScouredYarn:Option4—Scouredyarnatequilibriumwiththestandardatmospherefortestingtextiles.Option5—Oven-dried,scouredyarn.Option6—Oven-dried,scouredyarn,pluscommercialmois-tureregain.Option7—Oven-dried,scouredyarn,pluscommercialal-lowance(commercialmoistureregain,plusanallowanceforfinish).1.5Specimensusedtodetermineyarnlineardensitymayalsobeusedtodeterminetheskeinbreakingstrengthoftheyarn.Hence,thismethodprovidesthesequenceofstepstobefollowed,todetermineboththeseyarnproperties.NOTE1—Thelineardensityofyarnsproducedwithjute,orglass,mayalsobedeterminedbythefollowingapprovedmethods:SpecificationsD541,D578,andD681.Thelineardensityofshortyarnsegments,raveledfromfabrics,maybedeterminedbyTestMethodD1059.1.6ThevaluesstatedinSIunitsaretoberegardedasstandard.ThevaluesshowninparenthesesareapproximateconversionstoU.S.customaryunitequivalents.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D123TerminologyRelatingtoTextilesD541SpecificationforSingleJuteYarn3D578SpecificationforGlassFiberStrandsD681SpecificationforJuteRoveandPliedYarnforElectricalandPackingPurposes3D1059TestMethodforYarnNumberBasedonShort-LengthSpecimensD1578TestMethodforBreakingStrengthofYarninSkeinFormD1909StandardTableofCommercialMoistureRegainsforTextileFibersD2257TestMethodforExtractableMatterinTextilesD2260TablesofConversionFactorsandEquivalentYarnNumbersMeasuredinVariousNumberingSystemsD2258PracticeforSamplingYarnforTestingD2494TestMethodforCommercialMassofaShipmentofYarnorManufacturedStapleFiberorTowD4849TerminologyRelatingtoYarnsandFibers3.Terminology3.1ForallterminologyrelatingtoD13.11,CottonandFibers,refertoTerminologyD4849.3.1.1Thefollowingtermsarerelevanttothisstandard:commercialallowance,commercialmoistureregain,direct1ThistestmethodisunderthejurisdictionofASTMCommitteeD13onTextilesandisthedirectresponsibilityofSubcommitteeD13.58onYarnsandFibers.CurrenteditionapprovedJan.1,2007.PublishedFebruary2007.Originallyapprovedin1961T.Lastpreviouseditionapprovedin2001asD1907–01.2ForreferencedASTMstandards,visittheASTMwebsite,@astm.org.ForAnnualBookofASTMStandardsvolumeinformation,refertothestandard’sDocumentSummarypageontheASTMwebsite.3Withdrawn.1Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959,UnitedStates.yarnnumberingsystem,indirectyarnnumberingsystem,lineardensityforfiberandyarn,skein,yarnnumber,yarnnumberingsystem.3.2Forallotherterminology,refertoTerminologyD123.4.SummaryofTestMethod4.1Specifiedlengthsofyarnarewoundonreelsasskeins,andweighed.Thelineardensityoftheyarniscomputedfromthemassandlengthoftheskein.Insomeoptions,theskeinisscouredbeforeweighing,and,dependingontheoptionchosen,themassoftheskeinmaybedeterminedafterovendrying,orafterconditioning.5.SignificanceandUse5.1TestMethodD1907isconsideredsatisfactoryforacceptancetestingofcommercialshipments,sinceithasbeenusedextensivelyinthetradeforthatpurpose.5.1.1IncaseofdisputearisingfromdifferencesinreportedtestresultswhenusingTestMethodD1907foracceptancetestingofcommercialshipments,thepurchaserandthesup-pliershouldconductcomparativeteststodetermineifthereisastatisticalbiasbetweentheirlaboratories.5.1.2Competentstatisticalassistanceisrecommendedforthedeterminationofsuchabias.Asaminimum,thetwopartiesshouldtakeagroupoftestspecimensthatareashomogeneousaspossible,andthatarefromthe